Yeah, but are you rating the likeability/praiseworthiness of the main character, or the 'goodness' of the movie, in entertainment terms? Those are not always the same thing.
Yeah, Cap is more likeable/admirable than Tony, though it takes both kinds, but I think the first Iron Man movie probably is the best of the lot of the MCU that I've seen, as a movie, while IM 2 may be the worst as a movie.